1 Someone or something that has been left out or excluded.
1.1 mass noun -The action of excluding or leaving out someone or something.
1.2 A failure to fulfil a moral or legal obligation.
Late Middle English: from late Latin omissio(n-), from the verb omittere (see omit).
This is my admission that there was a sad omission, no word yesterday! Today’s word will need to do double duty. Let it be as if Wednesday didn’t happen this week.